> Amazing as it seems,build-up of acrylic conformal coat can cause solder joint failures.We do not allow dip coating on assemblies which have surface
> mount components.We spray coat to attain a uniform thickness of 1 to 3 mils.

Dewey



> What are the ramifications/advisability  of applying an acrylic conf coating
> to a thickness of 20 mils over an assembly.  The various components have this
> coating under as well as over the components so that it appears "potted"
> instead of coated.
>
> During temp cycling the solder joints on surface mount are popping.
>
> Susan Mansilla
> Robisan Lab
>
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--
Dewey Whittaker
Honeywell -- Air Transport Systems Division
US Mail: P.O. Box 21111 MS: M16A2 Phoenix AZ 85036
Phone: +1 602 436 436-2766
NSFnet: [log in to unmask]